在高速铣削试验的基础上，研究高速切削时切削速度对切削力的影响。结果表明，在切削速度较低的情况下，切削力随切削转速的增加而增大，但达到某一临界速度后,随着切削速度继续增大，剪切角增大，造成切向切削分力下降。不同刀具材料与工件材料的匹配在不同切削条件下有不同的临界切削速度。

根据加工工件来优化选择刀具，包括刀具材料、刀具几何参数、刀具结构、切削参数和机床等切削数据，将关系到生产效率、生产成本及加工质量。建立切削数据库，向机械制造业提供合理或优化的切削用量，是增强企业竞争力最有效的措施之一。本文结合国内外切削数据库研究开发现状，探讨建立切削数据库的核心技术，分析切削数据库研究及应用过程中存在的问题，着重探讨切削数据库的发展趋势，指出切削数据库未来的研究方向将是集成化、智能化、实用化、网络化和标准化。

High-speed machining has received important interest because it leads to increase of productivity and a better workpieces surface quality. Holwever, at high cutting speeds, the tool wear increases dramatically due to the high temperature at the tool-workpiece interface. Tool wear impairs the surface finish and hence the tool life is reduced. That is why an important objective of metal cutting research has been the assessment of tool wear patterns and mechanisems. In this paper, the wear performances of PCBN tool, ceramic tool, coated carbide tool and fine-grainde carbide tool in high-speed face milling are presentde when cutting cast iron, 45 temperde carbon steel and45 hardende carbonsteel. The tool wear patterns were examinde through a toolmaker's microscope. The research results show that the tool wear types differed in various matching of materials betweenthe cutting tool and the workpiece. The dominant wear pattrens observed were rake face wear, flank wear, chiping, fracture and breakage. The main wear mechanisms were mechanical friction, adhesion,diffusion and chemical wear promoted by cutting fores and high cutting temperature. Hence, the important considerations of high-speed cutting tool materials are high heat-reistance and wear-resistance, and chemical stability as well as resistance to the failure of coating. The research results will be of great benefit in the design and Science B.V. All rights reservde.

Several hitherto unrealized advantages would follow if each shop floor machine could compile its own machining database autonomously. This paper focuses on CNC turning to develop a shop floor friendly method for determining the cutting force component normal to the machined surface as well as the lumped static stiffness parameters of the machining set up solely from onmachine part inspection data gathered immediately after machining. It is shown that one can also estimate the shear and chip flow angles as well as the tangential and feed forces by combining this method with a suitable predictive model of the turning operation.

High speed machining has received important interest because it leads to an increase in productivity and a better workpiece surface quality. Experimental investigation of the impact of tool materials and cutting parameters on surface roughness in high speed machining is presented in this paper. The surface roughness of machined workpiece is measured when high speed face milling of hardened carbon steels and cast iron by using PCBN and ceramic tools at various combinations of cutting speed and feed rate. The experimental results show that the surface roughness tends to decrease with increases of the cutting speed, but further increases of cutting speed cause an increase in surface roughness. Lower surface roughness is obtained by using less feed rate at high cutting speed region, which is as expected the same as at conventional cutting speeds. It is anticipated that the minimum surface roughness could be obtained by selecting the appropriate cutting speed and feed rate for the given material pairs between workpiece and cutting tool.